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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Eco-friendly synthesis of bimetallic AuAg nanoparticles

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Author(s):
Garcia, Amanda G. [1] ; Lopes, Pietro P. [1] ; Gomes, Janaina F. [1] ; Pires, Cleiton [1] ; Ferreira, Eduardo B. [1] ; Lucena, Rubens G. M. [2] ; Gasparotto, Luiz H. S. [1] ; Tremiliosi-Filho, Germano [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Rio Grande do Norte, Inst Quim, BR-59072970 Natal, RN - Brazil
Total Affiliations: 2
Document type: Journal article
Source: NEW JOURNAL OF CHEMISTRY; v. 38, n. 7, p. 2865-2873, 2014.
Web of Science Citations: 29
Abstract

In this study we report a friendly route to produce colloidal AuAg bimetallic nanoparticles (NPs) using glycerol as a reducing chemical in alkaline medium. Ultraviolet spectroscopy (UV-Vis) and transmission electron microscopy (TEM) confirmed the formation of colloidal NPs. The nanoparticles were also directly produced on carbon to yield Au/C, Ag/C and AuAg/C. Extended X-ray absorption fine-structure (EXAFS) spectroscopy at the Au L-3 edge evidenced surface segregation of silver in the AuAg/C material. Also the X-ray absorption near edge structure (XANES) region indicated a slight reduction in the Au 5d band occupancy due to the presence of silver. Since a fuel cell is a potent source of energy for the future, the catalytic properties of the NPs were investigated for anodic glycerol electro-oxidation reaction and results for AuAg NPs are compared with those for monometallic Au and Ag NPs. When compared with Au/C, the AuAg/C material displayed lower potential for glycerol electro-oxidation, reducing by 120 mV the onset potential for glycerol electro-oxidation. This means that the electro-oxidation of glycerol on the bimetallic catalyst is mainly affected by the ligand effect. (AU)

FAPESP's process: 12/10856-7 - Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticles
Grantee:Amanda Cristina Garcia
Support type: Scholarships in Brazil - Post-Doctorate